Flying shears



FLYINQ SHE/ms 9 sheets-sheet 1 .www

N ff m em* uk wk MN, 9 SQ 2 Q m. S v F mm. N QQ. MWN uw Nv. mhw Q d v N y w N A g N 1 o D mm N H n@ n uw N. R w Q Nov. 8, 1927.

F. L. SESSIONS FLYING SHEARS Filed Sept. 29, 1924 *kb l Sx o o @OO mo oo 00.00@

Nillll /NvE/yme: f

Nov. 8, 1927.- 1,648,829

, F. L. SESSIONS FLYING sHEARs Filed Sept. 29, 1924 9 Sheets-Sheet 4 Nov. 8, 1927.

F. L. SESSIONS FLYING sHEARs Filed sept. 29. 1924 9 sheets-sheet "5 Nov. s, 1927. 1,648,829

F. L. sEssloNs FLYINGSI-IEARS Filed sept. 29. 1924 9 sheets-sheet s /N VENTO@ x Nov. 8, 1927.` 1,648,829

F. L. SESSIONS FLYING SHEARS Filed Sept. 29, -1924 9 Sheets-Sheet 7 /NwENm/P:

Na. s, 1927.`

F. L. sEssloNs FLYING SHEARS Filed Sept. 29. 1924 9 Sheets-Shqet 8 Nov. 8, 1927. 1,648,829

F. L. SESSIONS FLYING SHEARS Filed Sept. 29, 1924 9 Sheets-Sheet 9 lill- 1 MW PateiitedeeNarn, 192Z-1 lcierran STATE/s PATENT {oF-FICE. l

FRANK L. SESSIONS, OF LAKEWOOD, OHIO, ASSIGNOR TO THE ELYBIA IRON AND BVTEEL I COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

FLYING SHEABS.

Application :Bled September 29, 1924. Serial No. 740,595.`

l shown in that application.

v The principal object of my invention is to provide an 'automatic dying-shear or cutting-oh device for severing continuously-fed, lineal tube into measured lengths when the tube is moving at relatively high speed. An-` other object is to provlde an apparatus which is adapted to sever lineal tube into measured lengths without stopping or retarding the speed of travel of the tube when the tube is traveling at any speed at which it may be formed or welded. .A further object of my invention is to provide a flying shear'in which thev center of gravity of the moving parts, that is to say o the parts .-39 of the dying shear 4which are put into motion and travel along with the vtube during the cut-ting on' operation, is substantially 1n the line of travel of the tube and substantially in the plane of support of the moving 3o parts. In iiying shears with which I am familiar vand which have been adapted to cut od tubing while in motion I have yobv served that when the center of gravity of the machine is not substantially in the line oi? travel ofy the tube and not in the plane of the support of the moving parts the whole structure is subjected to severe and injurious shocks when it is being started and stopped. As the cutting 'oli' operations must take place regularly between short intervals of time these repeated shocks-cause rapid deterioration and costly upkeepof the machine and frequently cause damaged output.

.My invention is aimed to overcome these objections and to accomplish 'the desirable disposition of the weight of the moving parts I provide among other improvementsv a punch press having a hollow crank-shaft' passesp through which the tube to be severed 552 longitudinally.

` In the accompanyin drawings Fig. 1 is a plan View ofl the' ying shear mounted upon the end of a tube forming or a tube forming and`welding machine;

Fig. 2 is a side elevation of the apparatus shown in Fig. 1 having a small section broken away to disclose the valve trip lever for shifting the air 'valve to reverse the movement ofthe flying shear after the cut- I ting-oit' operation; Fig. 3 is a top plan view ofthe iiying shear or cutting-0E device drawn to a larger scale than Figs. 1 and 2;

Fig. 4 is a side elevation of the apparatus shown in Fig. 3;

Fig. 5 is a front or delivery end elevation of the cutting-off device shown in Fig. 4;

Fig. 6 is a section on line VI-VI ofl Fig. 5;

Fig. 7 is a vertical, longitudinal section on line VII--VII of Fig. 5;

Fig. 8 is a section on line VIII-VIII ofFigs. 4 and 7;

Fi 9 is a section online IX-IX of Fig;

Fig. 10 is' a section on line X-X of Fig. 9;

Fig. 1l is a'section on line XI-XI of Fig. 9;

Fig. of Fig. 4;

Fig. 13 is a section on line XIIIe-XIII of Fig. 12, enlarged;

Fig. 14 is 'a section similar to Fig. 13 but lshowing the lock bolt in released position.;

Fig. 15 is a sectionfdrawn to a larger scale on line XV-XV of Fig. l12;

12 is a section on lin-e XII-QXII l Fig. 16 is a section on line XVI--XVI of Figs. 3, 7 and 8; Fig. 17 is a top plan view of the electric contact device;

Fig. 18 is a sideelevation of the electric` contact device shown in Fig. '17

Fig. 19 is a section on line XIX--XIX of F 1g. 18; f F Fig. 20 i's a section on line XX-XX of Fig. 21 is a side elevation of the air valve trip lever construction;

Fig. 22 is a plan view of, the air valvel trip lever construction;

Fig.l 23 is a section on line XXIII- XXIII of Fig. 5; and

Fig.,24 is asection on line XXIV-XXIV o Fig. 5.

' end of a tube forming or a tube formn and welding machine, A designates the ying shear; B designates the tube feeding mech-A anism which, as shown, consists of a set of tube straightening rolls which are power a solenoid which operates driven by means of suitable gearing from` the main drive shaft, C, of the tube forming or tube forming and welding machine; D designates a guide conveniently formed of a structural angle, which supports the tube as it emerges from the flying shear and is of sufficient length. to accommodate the4 longest tube. l E is an electric contact de-l vice which is secured adjustably upon the angle guide, D, and is adapted to be set in the position required to measure the length of the tube which is to be cut off. The ying shear, A, is shown mounted to travel upon the frame, F, of thev tube forming or tube forming and welding machine but it will be understood that the flying shear maybe mounted upon an independent supporting structure and the tube may be fed to it from any source andin any suitable manner.

The tube which is to be cut into measured lengths is shown at 1. It maybe fed forward by means of the. straightening rolls, 2-2, or other suitable feed rolls, the movement, whichl may be continuous, being'from left to right as shown in Figs. 1 and 2.

When the leading end of the moving tube, 1, strikes the electric contact device, E, it

causes an electric circuit to be closed through a valve to admit compressed air 1nto a' cylinder behind a piston which propels the iying shear, A, upon its forward traversing movement with the tube. By suitable mechanism which will be` described, the flying shear is operated and the tube is severed'while they areltraveling at the same speed. The flying. shear isv then returned by compressed air to the starting position in Figs. land 2. The tube, 1, may befed continuously through the flying shearand measured lengths cut olf in succession as the end of the tube engages the electric contact device, E. The cut-off lengths of tube-are successively pushed out of the guide, D, by the oncoming tube,

lThe flying shear, vA, provided with truck wheels, 33, which are adapted yto roll on the rails, 4, which are secured to and supported by the frame, F, or other suitable support. It will be observed that by passing the tube through the hollowcrank-shaft of the punch-press which constitutes the tube cutting off mechanisms, it is possible to keep the center of gravity of the moving parts substantially kin the plane of support.

.I prefer to sever the tube byv means of a blade, 5, of known construction which is selcured to the plunger, 6, of the punch-presa l f portion of the flying shear. The blade, 5,

plunger, 6, and the clamping dies, 7, 7, are

st seen .in Figs. 5, 6 and 7 Sheets 4 and 5 of the drawings. As the blade, 5, startsv downward, propelled by the plunger, 6, the dies, 7-7, are automatically closed about the tube and firmly engage it so as-to insure that the flying shear has the same speed of travel as the tube and also to properly support the rtIlilllie for the blade, 5, to pass through it.

e 6, an blade, 5, in their vertical movements is designed to make a single stroke downward and return to the upper limit of its travel during one cycle of movement of the flying-shear forward to sever the tube and backward to its starting position.

I prefer to construct the punch-press with a hollow crank-shaft, 8, the longitudinal aperture through the shaft being shown at 9. The end of the shaft, 8, where the tube enters is bell-mouthed as shown at 10. Atl the other end of the crank shaft, 8, a bushing, 11, also .having a`bell-mouth may be provided to guide the tube into the dies, 7. The bushing, 11, is made so that it may be readily removed and. replaced by a bushing of roper s ize to guide another size of tube.

pon the end of crank shaft, 8, adjacenty prefer to make the crank, 12, in the form ofan eccentric disc asshown in Fig.l 16. The connectmg rod, 13, is mounted upon the punch-press which drives the plunger, y

crank, 12, and is provided with a suitable aperture for the reception ofthe plunger or cross-head pin, 14. One end of the crosshead pm, 14, is carried in an aperture in the plunger, 6. I prefer that pin, 14, be secured rlgldly to the plunger, 6, and that it be perm1tted'to rotate in a suitable bearing bushing, 15, 1n the connecting rod, 13. The crank shaft, 8, is supported for rotation in su1table pedestal bearings, 16 and 17, which are part of or are mounted upon the punchvpress frame, 18.

A motor, 19, bp/itably mounted upon frame, 18, may be provided for driving the flywheel of the punch-press continuously so long as the machine is to be operated. In the drawings` the motor is shown connected to drlve the fly-wheel, 20, of the punchress by means ofthe chain belt, 21. The

y-wheel, 20, 1s mounted lfor free rotation upon the shaft, 8, and a bearing bushing, 22, may be provlded in the bore of the fly-wheel.- A y well known means may be provided for lubricating this bearing.

I prefer to make the sprocketwheel, 23;

mounted upon the lhub of fly-wheel, 20, and` secured thereto against rotation and also lll against longitudinal displacement by means f o driving pins, 24. A driving collar, 25, isI mounted upon shaft, 8, and rigidly secured thereto. It is spaced from the hub of iy' wheel, 20, by the spacing ring, 26, forming tions are preferably the ends of steel keys,

yse

27, secured in apertures in the liy wheel hub with their ends projecting to engage the striker, 28, to rotate the crank shaft to op' crate the punch-press. The collar, 25, is provided with a key-way or aperture in which the striker or driving key, 28, is slidably mounted. One side of this striker is cut away to form a shouldered recess for the reception of a spring, 29. A plate, 30, se-

cured to the end of collar, 25, by screws, 31,.

enters the spring recess to form an abutment' for one end of they spring, 29, the other end of which abuts against the sliding key or striker, 28. It will be seen that the striker,

28, is normally held pushed toward the iiywheel, 20, by the spring, 29. Y

A'sliding bolt, 32, is provided' having a support in a bracket, 33, whch may be attached to or form a part. of frame, 18. A spring, 34,.secured at one end to a pin, 35, which is secured to the sliding bolt, 32, and at the other end to a pin, 36, which is ,secured in the bracket, 33, acts toihold the bolt, 32, in its innermost position. rlhe sliding bolt, 32, 15, Sheet 8), is bevelled circumferentially and the adjacent inwardly facing side of the projection, 37, of striker, 28, is correspondingly bevelled so that upon rotation of the shaft, the bevelled sliding belt will engage the bevelled end of the striker and withdraw it out of its range of contact with the driving projections, 27, of the y-wheel. rlhe dri-ving connection` between the fiyewheel and the crank shaft isJ thus disconnected and by suitable braking mechanism the crank shaft is brought to rest.

rthe keys, 27, are secured against endwise' displacement by thel ends of driving pins, 24, which, as seen 'in Fig. 7, Sheet project into suitable recesses in the keys, 27.

A double acting piston, 38, is provided which is fitted to opertlte in an'air cylinder, 39. A piston rod, 40, extends outwardly from the piston, 38, and is connected by the pin, 41, to a depending bracket, 42, of the punch press frame, 18. The piston, 38, and

piston rod, l40, are preferably located directly underthe center line of the crank shaft, 8, and, preferably, the pist-on rod is connected to the punch-press frame as near as possible to the center of the crank shaft, 8. This is in order that the force of the piston may be exerted as nearly as possible on a line passing through the center ofgravity of the flying shear'structure. The cylinder, 39, is secured to the stationary frame, F,'and virtually is a part of it.

Air is admitted to the cylinder, 39, through a slide valve of known construction (not shown) which is enclosed in the valve chest, 43, (Fig. 8, Sheet 6). An electromagnetic4 solenoid, 44, is provided for operating the air valve for admitting air into the cylinder, 39, .behind piston, 38, to move the liying shear in its forward traversing movement with the tube. The valve rod, 45, has an adjustable portion. which extends forward and has adjustably secured toit a trip lever, 46 (Fig. 2, Sheet 1), which is engaged by the punch-press frame at the proper point in its forward travel, after the press has made its cutting-olf stroke, toshift the valve so as to stop the admission of air behind the pist-on, 38, and admit it into thecylinder in front of the piston. By the same movement of the valve an `exhaust port from the rear end of cylinder, 39, is opened and the vair which drove the piston forward is permitted to escape from the rear end of the cylinder while the compressed air entering the frontend of the cylinder pushes the piston backward and returns the punch-press to its starting position. A wearing plate or bumper, 46a, shown in Figs. 2, 3 and 5 and in dotted lines in Fig. 2.1, may be secured' to the forward, bottom edge of flame. i8, for engaging lever, 46.

Shock absorbers or bumpers, 47, are provided to cushion the punch-press both on the forward .and backward movements.

-Secured to crankshaft, 8, by means of a' key7 48, or other suitable driving connection, is a brake drum, 49. A pair of brake shoes, 50 and 51, held by levers, 52 and 53, are adapted to be applied to the brake drum, 49. Levers, 52 and 53 are fulcrumed at 54 and 55 to the frame, 18, at one side of brakedrum, 49, and their other ends are connected by a rod, 56, which passes through apertures in the ends of the levers and carries a spring, 57, which is a apted to yieldingly press upon one of the le towards it by means of the. rod, 56, (F ig. 9, Sheet 7). The brake shoes, 50 and 51, are thus normally applied to the drum, 49. A brake releasing lever, 58, is provided. It is mounted upon and keyed to a shaft, 59, rotatably mounted in an aperture at one end of the lower brake lever, 53. AA short lever, 60, lalso 'keyed to shaft, 59, forms one member and a link, 61, forms the other mem.- ber of a toggle which is adapted to separate `the ends of levers, 52 and 53. To release the brake, the lever, 58, is bpera't'ed to ro 'tate theshaft, 59, to cause the toggle links s and draw the other lever i .Figs 9. and 10, Sheet 7. In the frame, 18,

of the punch-press there is mounted for vertical movement, a bar or latch, 62, by means of a pair of pivoted links, 63 and 64. B ar, 62, is provided with a slot, 65, through which the lever, 58, passes.y To the lower end of bar, 62, is pivoted a finger, 66, which 1s adapted to engage a lug, 67, adjustably secured Ito the stationary fra-me, F. As the punch-press starts forward upon its forward travel with the tube, the finger, 66, engages projection, 67 andthe bar, 62, is thereby raised thus raising the end of lever, 58, to release the brake. As soon as the crank shaft starts to rotate, a cam, 68, which is mounted upon or forms part of the brake drum, 49, and which has a Adwell portion forming a large part of its circumference rotates under roller, 69, which is carried by lever, 70, which is ke ed to shaft, 59. The brake is thus held re eased until roller, 69, comes to the depressed ortion, 68a, of the cam surface shown in otted lines in Fig. 9, Sheet 7. As the ress continues in its forward movement, nger, 66, as:es over lug, 67, and is loosely suspende from the bar, 62, duringthe remainder of the forward and backward movement of the press. As the crank shaft, 8, is nearin the'end of a revolution the striker, 28, is withdrawn by bolt, 32, from contact with driving projection, 27, and the cam-lift roller, 69, enters the depression, 68a, in the cam surface and permits the brake shoes, 5 0 and 51, to be applied by spring, 57. As the press returns to its starting position the linger, 66, which actuates bar, 62', agein drops back of lug,

67 (Fig. 10, Sheet The 'brake releasing mechanism just described operates to lift the brake shoes from drum, 49, before the crank-shaft, 8, starts to rotate.' The brake' is therefore always released and the crank-shaft is free to rotate beforev the striker, 28, engages one of the ldriving projections, 27, of Ey wheel, 20.

In Figs. 9, 10 and 11, Sheet 7, it will be seen that each of the brake levers, 52 -and 53, is composed of a pair of .spaced-apart bars, between which the brake shoes, and 51, are respectively mounted on transverse ins, -71 and 71a, respectively. The toggleink, 61, is mounted upon a transverse ypin, 72, secured to the upper brake shoe lever, 52.

The means for. withdrawing the sliding bolt, 32, and releasing the striker, 28, so that it may engage onel of the projections, 27, upon the fly wheel, 20, is seen in Fig. y5 Sheet 4; Fig. 8 Sheet'6;I and Fi s. 12, 13 and 14, Sheet 8. To the member, 3, of the stationary frame, F, there are secured a pair of projecting lugs, 74 and 75, which are 'adapted to engage the ends of levers or star wheel teeth, 76 and 7 7,.which are keyed or otherwise secured to a vertical shaft,l 78, which is rotatably mounted in bearings' in bracket, 33. At the upper end of this vertical shaft, 78, there is a fianged head, 79,

and inthe slot there is pivoted a pawl 83,v seen in Figs. 13 and 14. Pawl, 83, is notched near one end and the shoulder thus formed is adapted to be engaged bythe corresponding end of trigger, 80. A spring, 84, which is secured to sliding bolt,'32, presses u on one end of pawl, 83, and yieldingly h ol s it imposition to be engaged by trigger, 80.

The lug, 74, is so 'located that the star Wheel tooth, 7 6, does not engage it upon the forward movement of the press until the brake shoes, 50 and 51, have been released. As the ress moves forward star wheel tooth, 76, stri es lug, 74, the shaft, 78, is rotated in the direction shown by the arrow in Fig. 13 and trigger, 80, pushes back the sliding bolt, 32, and releases the striker, 28. Shaft, 7 8, is rotated far enough by star wheel tooth, 76, to cause the trigger, 80, to be disengaged from the pawl, 83and sliding bolt, 32, is immediately returned by spring, 34. Fig.

14 shows the trigger atA the point of releas- A ing the pawl.

The rotation of the shaft, 78, during 'the forward movement of the punch-press also places star wheel tooth, 77, in position to be engaged by lug,'7 5. Upon the return movement of the punch-press, the shaft isthere-` fore rotated 1n the opposite direction fromV that indicated by the arrow in Fig. 13, and trigger, 80, is thereby returned into the position shown in Fig. 13, the spring, 84, yielding to permit the trigger to depress pawl, 83, and pass over it into .enga-gement with its shoulder. f

As soon as trigger, 80, has withdrawn the sliding lock bolt, 32, from its engagement with striker, 28, the latter "is moved by spring, 29, into position to be engaged by one of the driving projections, 27 of flywheel, 20, and whenthis engagement ocion curs the crank-shaft starts to rotate. As the shaft, 8, approaches the end of a revolution, the bevelled surfaceof the sliding bolt, 32, engages projection, 37, of the striker, 28, and withdraws it from its driving engagement with the fly-wheel thus permitting the brakes to bring the shaft to rest with the plunger, 6,- at the top ofits stroke.

The electric contact makingdevice shown in Figs. 17, 18, 19 and 20, Sheet 9, comprises 'I a supporting frame builtjup of two pedestals,

85and 86, which are connected 'by a bar, 87. The pedestals, 85 and 86, have angularly ycarries at itswouter enda roller, 92, which is adapted to be engagedv by a plun er, 93. The plunger, 93, is slidably mounte in the forward edestal, 85, and is normally held in the position shown inv Fig. 417, by the spring, 94. One end of plunger, 93, is laminated and extends through slots in the end of edestal, 85. This end of pedestal, 85, is

velled so that when the end of. the tube engages the laminated projecting portion or anvil 93b of plunger, 93, and pushes the plunger back to close the electric switch, 90, the end of the tube is pushed to one side and out of guide, D.

The rear end of plun er, 93, is bevelled at' 93 for engaging rol er, 92. When the plunger is pushed backward by the tube the roller islifted; the lever, 91, is rotated about its fulcrum, 95; and the switch, 90, is closed thereby permitting electric'current to pass through the solenoid, 44, and move the valve of the air cylinder to admit air into the cylinder, 39, back of piston, 38, and start the cutting-olf press upon its forward movement. y

The object of laminating the end of plunger, 93, is to avoid the necessity for making a round hole in the end of pedestal, 85, which is bevelled to deflect the tube. If a round hole were made in the end of the pedestal throu h the bevelled surface the end of the tu emight catch upon the edges of the hole or a small tube might enter the hole and the tube would not be dellected out of the guide, D. The width of the slots for the laminated end, 93", of the plunger, 93, should be less than the diameter of the smallest tube which is to be handled by the machine.:

A small forward movement of the lezidin` A end of the tube suliices todeflect it out o contact with the end of plunger, 93, which is then returned to its vnormal position by spring, 94, and the switch, 90, is opened by spring, 96, assisted by the 'weight or roller,

92.' The opening of switch 90, should occurv before the punch-press frame engages valve trip lever, 46, to shift the valve to admit air to theeylinder, 39, for returning the punch- As soon as a length'of tube has been cut oi by the iying shear the oncoming tube pushes the cut-olf piece ahead and b this movement its leading end is pushed o from guide, D, until the unsupported end overbalances that part ofthe tulwhichrisrin the guide and the severed lengthvof tube falls oi! to one side of the guide to be disposed of as desired.

The air valve reversing mechanism of which valve trip lever, 46, is a part coinprises an adjustable support, 97, which is mounted upona plate, 98, secured to the frame, F. The support, 97, has two upright portions which are slotted to form a. ulde for an extension, 99, of valve rod, 45. referably valve rod extension 99, is a rectangular bar having a series of apertures, 100, which are spaced. apart and adapted to receive the fulcrum pin, 101, of trip lever, 46.-

The upper end of trip lever, 46, is adapted to be engaged by the punchress frame, 18, and the lower end is pivote at y102 to a link, 103, which in turn is pivoted to the support, 97. The plate, 98, has a series of holes, 104, for receiving the'screws which secure the support, 97, to it. It will be seen thatthe support 97, ma be secured to the plate, 98, 1n as many di erent sets of threaded holes 1n plate, 98. In addition to this adjustment the series of apertures, 100, in the valve rod extension, 99, permit a still further adjustment of the'position of valve trip lever, 46, relative to the longitudinal travel of the punch-press, and a turn buckle, 45, Fig. 8, Sheet 6, affords still closer adjustments.

Lugs, 74 and 75, for engaging the star wheel teeth which rotate shaft, 78, to withdraw the sliding bolt, 32, andreturn the trigger, 80, into o eratlve osition respectively, are adjustab e longitu inally of the travel of the punchspress by. means of perforations, 105, which are adapted to receive the screws which securethe lugs, 74, and 75, to the angle member, 73, of the frame, F. The series of holes, 105, are shown in Fig. 4 and the ad- -justment of the lugs, 74 and 7 5, may be eas- 1ly lunderstood from this figure. v By a'djustl ingthe-position of lug", 74, the starting of the crank shaft-into rotation may be made to occur at any point found desirable. This will differ somewhat with the air pressure which actuates the punch-press in its-traversing movement as well as withthe speed of travelofthe tubing which is to be cut olf. It'will be -understood that it is desirable that the speed of travel of the'punch press be substantially equal to that of the speed of travel of the tube at the instant when the" dies, 7,

close upon the tube. A slight variation in`Y the relative speed of travel of the tube and Sitions as there are cured to a bar or plate, 106, which forms part of stationary frame, F. As seen in Fig. 8, Sheet 6, thebase portion, 107 is provided with slots, 109, through which boh-S, los, pass and secure it to plate, 106, in an obviously adjustable manner.

It will be seen that with the adjustable features embodied in valvev trip lever', 46,

striker release mechanism including lugs, 74:

i vse and 75, and the brake releasing lug, 67, all of the timing functions of the device can be readily adjusted and controlled.

By careful adjustment of the position of the electric contact device lengths of tube can be cut olf with suilicient uniformity .for commercial purposes. A

In Figs. 5, 6, 23 and 24, Sheet 4, the dies and the die operating mechanism are clearvly shown.. The cutting dies, 7, are made in four sections lwhich are assembled and accu- -rately positioned and held in a pair of die blocks, 110. The die blocks, 110, are doweled together by four dowels, 111, which are spaced apart longitudinally I4lof the tube to not interfere with the blade, 5, or the die sections. rlhe dies, 7, are secured in the die blocks, 110, by means of screws, 112, which are threaded into die blocks, 110, and their heads project into slots which are cut in the outer surfaces of th'e die sections. When the screws, 112, are turned in the threaded apertures in die blocks, 110, the dies, 7, are moved longitudinally of the tube and may be adjusted accurately.

Plunger, 6, is adapted to slide vertically between wearing guides, 113, which are secured to the upright standards, 114, which may be a part of or be secured to the frame,

The die blocks, 110, are supported upon a finished surface upon frame, 18. rllhey are free to have limited transverse movement relatively to the tube to permit of their closing upon the tube and opening to permit the tube to pass freely through the dies, 7

rll`he die blocks, 110, and dies, 7 are moved toward and away from each other by an arrangement of levers which will now be described. Shouldered eye bolts, 115, are screwed into die blocks, 110, and are slidably mounted in'apertures in the standards, 1111. Eye bolts, 115, are pivoted at 116, to the main, die-operating levers, 117 Levers, 117

move up and down about their fulcrums, 119,

has the portion which fits into the lever,

117, eccentric to the portion which fitsv into the toggle link so that by rotating the pins, 122, the distance between the centers of the eyes of links, 120, and 121 may be varied and thereby' the throw of the lower end of levers, 117, may be also varied. The other ends of links, 120 and 121 are connected to a spring plunger head, 123, by means of a pin, 124.

Extending upward from the frame standards, 114, are rods, 125, which are rigidly secured to the frame standards and form upward extensions thereof. The upper ends of rods, 125, are secured in a yoke, 126.

Yoke 126, forms the upper abutment for a spring 127, which presses downward upon spring plunger head, 123, to force the toggle levers, 120, 121, loutward against levers, 117.

A threaded adjusting screw, 128, is secured in a threaded aperture in the top of plunger, 6. The head of screw, 128, is adapted to engage spring plunger head, 123, upon the upward movement of the plunger, 6, and thereby cause toggle links, 120, 121, to draw the, upper ends of levers, 117, toward .each other and separate the die blocks, 110, and dies, 7. .A plunger rod, 129, is attached4 to spring plunger head, 123,. and .ex-

tends upwardly through a guiding aperture in yoke, 126. The upper end of this plunger rod is threaded and carries nuts, 130, which may be'adjusted upon the plunger rod.

As the punch-press plunger, 6, starts on its downward movement the screw, 128, is lowered and permits spring, 127, to push plunger head, 123, downward and thereby exert force upon the toggle links, 120 and 121. When the nuts, 130, contact with the .top of yoke, 125, no further spreading movement of the links, 120, 121, can take place, consequently the inward movement of the dies, 7, is limitedl by the position of nuts, 130, on plunger rod, 129.

rl.`he point of the blade, 5, is'normally sufliciently above the surface of the tube, 1, to permit the 'dies,7, to be closed into firm engagement with thetube before the point of the blade starts to sever the tube. The dies, 7, are then held-closed by levers, 117 and toggles,'120 and,121, by the force of spring, 127', until the plunger has risen to 1 the point where the end of blade 5, is above head of bolt, 128, again engages plunger head, 123, and opens the dies, 7. Injury to f the top of the tube, 1. At this' point the the blade, 5, from movement of the tube in the dieswhile the blade is inthe path of the tube is thus avoided.

Fig. 23 shows details of construction of the fulerum joints between the bracket, 118, and levers, 117.

Fig. 24 shows details of the eccentric pins which connect levers, 117, and toggle links A 120 and 121.

In order that the various functions ofthe machine may be carried out efliciently and in proper sequence the machineis made to operate as follows: The forward end of the moving tube o erates the electric contact device, E, and c oses the circuit through the solenoid, 44, so that the valve in valve chest, 43, is operated to admit air behind piston, 38, and to open the exhaust outlet to the front end of cylinder, 39. This .starts the punchpress on its forward travel. As the punchpress starts forward the brake shoes, 50 and 51 are first released from drum, 49, and thereafter the sliding bolt, 32, is withdrawn to permit the striker, 28, to be'pushed into engaging position with pro'ections, 27, by

means of spring, 29. The engagement of one l of projections, 27, with striker, 28, causes the crank shaft,8, to be rotated by the fly wheel, v20, and motor, 1 9. The crankshaft makes a single i'evolution causing the plunger, 6, and blade, 45, to descend, cut-ofil 'the tube and return to the top of the stroke. As the crank-shaft nears the end of one revolution, the striker, 28, is withdrawn by engagement with the bevelled side c. of the bolt, 32, the brake shoes, 50 and 51, are automatically applied by spring, 57, when the depression in cam, 68, comes into position to permit roller, 69, to enter it; and the crank shaft is brought to rest, with the crank, 12', plunger, 6, and' blade, 5, in their uppermost positions. During theirst part of the downward movement of the plunger, the die, 7, is firmly closed on the tube by the spring, 127, before the point. of the blade has reached the tube and the die remains closed in firm engagement with the tube until the blade. has severed the tube and again risen to where its point clears the top and the tube fand the spring 127 is coniv pressed by the upward movement of plunger 6 and screw 128. The gripping of the die upon the tube insures that the punch-press and tube will be travelling at the same speed when the blade passes through the tube and 'further insures proper support for the cutting edges ofthe die against the metal of the tube adjacent the lcutting edges of the blade.

After the tube has been severed the iiying-shear continues to move forward until the bumper, 46a, of frame 18, engages and o crates the trip-lever 46, to shift the valve w ich controls the air that actuates pistn,

38, 'so as to cut olf the air from behindl the piston, open the exhaust from that end o f I the cylinder and admit air in front of the piston to return the iiying-shear back to its starting position. The rear bumpers, 47, arrest its backward movement, and it is held in its starting position 'by the air actingon the front end of piston, 38, until the solenoid, 44, is energized to admit air behind the piston to start the flying shear again on its cycle of operations. The forward bumpers, 47, assist in checking the forward movement of the Hying-shear and absorb' some of the shock due to the stopping and reversal of the heavy mechanism.

I claim:

1. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding the travelling stock, a shearing knife periodically actuated mounted on said carriage at the discharge end of said hollow shaft, and periodically actuated dies mounted on said carriage to engage said travelling stock and thereby insure synchronism in travel of carriage and stock.

2. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding the travelling stock, means for rotating said hollow shaft, a periodically actuated shearing knife mounted on said carriage, shearing knife actuating means periodically engaged by the rotation of said'hollow shaft,

periodically actuated dies mounted on said carriage to engage said travelling stock, and cooperating elements connecting said knife and dies. l

3. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon,l a rotatable hollow shaft in said carriage surrounding the-.travellin stock, meansfor rotating said hollow sha t,a periodicall actuated shearing knife mountedgon sai carriage, shearing knife actuating means periodically engaged bythe rotation of said hollow shaft, periodically actuated dies mounted on sald carriage to engage said travelling stock, co'- operating elementsconnecting said knife and dies, and a prime -mover to reciprocate said carriage.

travelling stock, comprisinga base, a' reciprocable carriage mounted thereon, a rotatable hollow 'shaft in saidcarriage surrounding the travelling stoik, meansfor rotating said hollow shaft, a. periodically actuated shearing knife mounted on said carriage, shearing knife actuating -means periodically engaged b the rotation of said hollowA shaft,

periodical y actuateddies mounted on said carriage to 'engage Isaid travellm stock, cooperating elementsconnecting sald knife and dies, a prime mover to reciprocate said carriage, and adjustable means to automatically control the operation of the prime mover.

5. Flying shear mechanism for severing travelling stock, comprising. a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surround- 1 ing the travelling stock, means for rotating motor, and vautomatically controlled engag-y ing devices to intermittently rotate 4the shaft able hollow shaft in said carriage surround-v .ing the travelling stock, means for rotating said hollow shaft, a periodically actuated shearing knife mounted on said carriage, periodically actuated dies mounted on said carriage to engage said ltravelling stock, cooperating elements connecting said knife and dies, a prime mover to reciprocate said carriage, adjustable means to automatically control the operation kof the .prime mover, a

by said motor. l

7. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said `carriage surround.

ing the travelling stock, means for rotating esaid :hollow shaft,l a periodically' actuated .shearing knife mounted on said carriage, periodically ,actuated ,dies mounted O11 Said carriage to `engage said ytravelling stock, co-

operating elements connecting said knife and dies, a prime vrmover to reciprocate said carriage, adjustable means to automatically control .the Aoperation .of the prime innover, a motor, .automatically controlled `engaging devices .to intermittently .rotate the shaft by Said motor., and braking means to .brins said shaft .to rest.

8. Flying shear mechanism yfor severing travelling stock, comprising a hase, a reciprocable carriage mounted '-thereoii, a rotatlable hollow shaft in said carriage surrounding the ,travelling stock, means for rotating said hollow shaft, a prime mover, said prime mover located directly beneath the hollow shaft, a double acting piston in said prime mover, a piston rod, said .piston rod connected to .said carriage at a point approirimately in line .with the center of gravity of said carriage.

:9. Flying shear vmechanism v`for severing ,travelling stock,.comprising a base, va reciprocable carriage mounted thereon, a. hollow shaft in said carriage surrounding the trav'- elling stock, a motor, a punch-press mechanism, a fly-wheel mounted to rotate about said shaft and driven by said motor, a. driving collar secured to said shaft, means intermittently connecting said fly-Wheel with said collar, and a crank and connecting rod driving said punch press mechanism from said shaft.

l0. Flying shear mechanism for severing, travelling stock, comprising a base, a reciprocable carriage mounted thereon, a hollow shaft in said carriage surrounding the travelling stock, a motor, a punch-press mechanism, a liy-wheel mounted to rotate about said shaft and driven by said motor, a driving collar secured to said shaft, means intermittently connecting said fly-wheel with said collar, a crank and connecting rod driv-l ing said punch-press mechanism from sald shaft, abraking mechanism, and adjustable means to automatically actuate said braking mechnism. I l i ll. Flying shear mechanism for severing traveling stock, .comprising abaste, a reciprocable `carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding the travelling stock, means for rotating .said hollow shaft, a periodically actuated shearing knife mounted on said carriage, periodically actuated dies mounted said ...Carriage to engage said travelling Steek, coy operating elements connecting said knife and ldies, a prime mover to reciprocate said ca rriage, adjustable means to automatically `oo ntrol the operation of .the prime mQYQl, .and

means to limit the travel of thecarriage.

12. Flying shear mechanism for severing ytravelling stock, comprising a base, a reeip `rocable Icarriage mounted thereon, a rotatable .hollow Shaft 1.11 said .Carriage Surrounding he 'travelling stock, a .m0-tof, .a vlauntfpiter mechanism mounted .on said carriage, a nywheel mounted to rotate about said shaft and driven by said motor, a driving collar secured to said shaft, means intermittently connecting said fly-wheel with said collar, a crank 'and connecting rod driving said punch-press mechanism v from said shaft, said unchpress mechanism including a vslietamiiig knife, dies mounted .on saideaI- riage, cooperating elements .conneeting saidknife and dies, a prime mover ,to reciprocate .said carriage, adjustable means to automatv ically control the operation of the .prime mover, means .to actuate the dies to vengage 4.the travelling stock and reciprocate the shearing knife and then disengage -the dies while lthe carriage is .travelling Ain one direction, and meansto limit the travelfof .the carriage.

13. Flying shear mechanism for severing travelling Stock, .Comprising @base a .resin rocable carriage mounted thereon, a rotat non able hollow shaft in said carriage surroundlin the travelling stock, means for rotating sald hollow shaft, a prime mover, a punchpress mechanism mounted on said carriage, means to operate said punch press mechanism, means actuated by said travelling stock to start the prime mover, and means constituting a part of said carriage to firmly engage the travelling stock and thereby insure synchronism in travel between the carriage and travelling stock.

ltlying shear vmechanism for severing travelling stoclr, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding the travelling stock, means for rotating said hollow shaft, a prime mover, means connecting the prime mover with the carriage, means actuated by said travelling stock to start the prime mover, means actuatedby said travelling carriage to stop and reverse said prime mover, and means to limit the distance travelled by the carriage,l

15. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding the travelling stock, means for rotatingv said hollow shaft, a prime mover, means cnnnecting the prime mover with the carriage, an electrically controlled valve to supply fluid to said prime mover, a switch actuated by the travelling stock to supply current to said electrically controlled valve, and means actuated by the travelling carriage to reverse said valve, and to supply fluid Ito actuate the prime mover in the opposite direction.

16. Flying shear mechanism for severing travelling Stock, comprising a base, a reciprocable carriage mounted thereon, a hollow shaft in said carriage surrounding the travelling stock, a prime mover, means connecting the prime mover with the carriage, an,

electrically controlled valve to supply fluid to said prime mover, a switch actuated by the travelling stock to supply current to said valve and thereby start the prime mover and propel the carriage,'a brake for said hollow shaft, means to release said brake, means to rotate said shaft, means to cut said travelling stock, means to apply said brake, and means to stop and reverse said prime mover.

17. Flyingy shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding thetravelling stock, means for rotating said hollow shaft, a prime mover, means connecting the prime mover with the carriage, a punch press mechanism, a motor, automatic means tc intermittently actuate said punch press by said motor, means actuated by said travelling stock to start the prime mover.,

means actuated by said travelling' carriage to stop and reverse said prime mover, and

means to limit the distance travelled by the carriage. v

18. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding the travelling stock, means for rotating said hollow shaft, a prime mover,

means connecting the prime mover with the carriage, a brake drum connected to the hollow shaft, a brake shoe, a compression means to apply said shoe to said drum, means to release said shoe from. said d, and adjustable means to actuate said releasing means.

19. l? lying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft in said carriage surrounding said travelling stoclr, means for rotating said hollow shaft, a prime mover to operate said carriage, a brake drum secured to said shaft, brake shoes arranged to engage said brake drum, levers supporting said brake shoes, means to draw said levers together and thereby apply the brake shoes to the drum, a toggle joint connecting said levers, a latch to actuate said toggle joint, and an adjustable lug on said base to engage said latch during the travel of the carriage and actuate the toggle joint and separate the levers.

20. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rom tatable hollow shaft in said carriage surrounding said travelling stoclr, a motor supported by said carriage, a dy wheel mounted for free rotation on said shaft, a driving collar secured to said shaft, a driving projection secured to said fly wheel and projecting toward said driving collar., a striker slidably mounted in said collar, and arranged y .ment with said driving" projection.

2l. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft mounted in said carriage surrounding. .said travelling stock, a motor supported by said carriage, a y wheel mounted for free rotation on said shaft and arranged to be driven by said .motor, a driving collar secured to said shaft, a driving projection secured to said fly wheel and project-ing toward said drivin collar, a striker slidably mounted in sai collar and arranged when extended to engage said driving projection, means to normally4 hold the striker in an extended position, and thereby engage the driving projection and rotate the driving collar, and means actuated by the movement ofthe carriage to withdraw ing projection.

the Striker from' engagement with the driv-l 22. Flying shear mechanism for severing travelling stock, comprising a basea reL ciprocable carriage mounted thereon, a rotatable hollow shaft mounted in said carriage surrounding said travelling stock, aA

motor sup orted by said carriage, a fly wheel mounted or free rotation on said shaft and arranged to be driven by said motor, a

. driving collar secured to said shaft, a driving projection secured to said fly wheel and projecting toward said driving collar, a striker slidably mounted in said collar and arranged .when extended toengage said driving projection, means to normally hold the striker in an extended position and there- -by engage the driving projection and rotate the driving collar and the shaft, means actuated by the, movement of 'the carriage to withdraw the striker from engagement with the driving projection at a predetermined point, braking means, and means to actuate the brake to stop the rotation of the shaft after the striker has been withdrawn from l' engagement with the driving projection.

travelling stock, comprisin riage surroundin a driving projection secured to said fly wheel and projectin toward said driving collar, a striker slidab y mounted in'said collar and arranged when extended to engage said driving projection, means to normally hold the striker in an extended position and thereby engage the driving projection and rotate the driving collar andl the. shaft, av crank and connecting rod actuated by said shaft, said connectingrod connected to said punch press mechanism and arranged to operate the. same, means actuated by the movement of the'earriage to withdraw the striker from engagement with the driving projection at the end of a complete cycle of thepunch press mechanism, braking means, and'means to actuate the braketo stop the rotation of the shaft after the striker has nbeen withdrawn from' engagement' with the driving projection.

24. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow 'shaft mounted in said carriage surroundin said travelling stock, a motor supported y said carriage, a punch press mechanism mounted on sald carriage, a pair of dies mounted on said carriage and arranged to be operated by said punch press,

ay wheel mounted lfor free rotation on said ,shaft and arranged to 4be driven by said motor, a driving collar secured to said shaft, a driving projection secured to said Hy wheel and projecting toward said driving collar, a striker slidably mounted in sai collar and arranged when' extended to engage lsaid driving projection, means to normally hold the striker in an extended posi tion and thereby engage the driving projection and rotate the driving collar and the shaft, a crank and connecting rod actuated by said shaft, said connecting rod connected to said punch pressi mechanism and arranged tooperate the same, said punch press arranged to close said dies upon the travelling stock during a downward stroke and to open said dies upon an, upward stroke, means actuated bythe movement of the carriage to withdraw the striker from engagement with the driving projection at'the end of a complete cycle ofthe punch press, braking means, and means to actuate the brake to stop the rotation of the shaft after the striker Vhas been withdrawn from engagement with the Idriving projection.

25. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage mounted thereon, a rotatable hollow shaft mounted in said carriage surrounding said travelling stock, a Vmotor supported by said carriage, a punch press mechanism mounted on said carriage, a pair of dies mounted on said carriage and arranged to be operated by said punch press, a iiy wheel mounted for free `rotation on said shaft and arranged to be driven by said motor, a driving collar secured to said shaft, a driving projection secured to said iiy wheel and projecting toward said driving collar, a striker slidably mounted in said collarI and arranged `when extended to engage said driving projection, means to nor mally hold the striker in an extended position and thereby engage the driving projection and rotate the driving collarand the shaft, a-cran and connecting rod actuated bysaid shaft, aid connecting .rod connected to said punch press mechanism and arranged to operate the same, a'prime mover to reciprocate said carriage, adjustable means actuated by the travelling stock to startthe prime mover, adjustable means actuated by the moving carriage 1to stop and reverse the pr1me mover, said punch press arran ed to close said dies upon the travelling stoc, during a downward stroke and to shear said stock, and to open said dies upon an lupward stroke, means actuated by the movement of the carriage to withdraw the .striker from engagement with the driving projection at the end of a/complete cycle of thespunch press, abraking means, and means to actuate the brake to. stop the rotation of the shaft, after the striker has been withdrawn from engagement with the driving projection, and means to discharge said stock after shearing.

26. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage thereon, a rotatable hollow shaft mounted in said carriage surrounding said travelling stock, means for rotating said hollowshaft, a prime mover to reciprocate said carriage, an electrically actuated admission valve to supply compressed air to said prime mover, electric contact devices actuated by said travelling stock to close a circuit through said solenoid and supply air to one end of said primernover and propel said carriage, adjustable means comprising a ,trip lever attached to said prime mover, adjustable means to actua-te said trip lever, said adjustable means and trip lever arranged to shut off and release the air, and to supply air to the other end of the prime mover and reverse the movement of the carriage. j

2?..lP`lying shear mechanism for severing travelling stock, comprising a base, a recipvrocalole carriage mounted thereon, a rotatalele hollow shaftmounted in said carriage surrounding said travelling stock, a motor supported bysaid carriage, said motor arranged to drive said shaft through automatic'adjustable engaging mechanism, a prime mover to reciprocate said carriage, said prime mover located beneath and in the center line of said rotatable shaft, a valve, a solenoid to control said valve, electric contact devices, said contact devices arranged to be actuated by the movement of the travelling stock and to close a circuit through said solenoid and to supply com- 'pressed fluid to one end of said prime mover through said valve and propel said carriage, adjustablev means comprising a trip lever attached to said prime mover, adjustable means to actuate said trip lever, said adjustable means and trip lever arranged .to shut olf the supply of compressed fluid to the prime. mover and release the fluid, and to supply compressed fluid to the other end of said prime mover, and reverse the movementof said carriage. t

28. F lying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage thereon, a rotatable hollow shaft mounted in said carriage surrounding said travelling stock, means for rotating said hollow shaft, a prime'mover to reciprocate said carriage, electric devices to control a supply of compressed fluid to said prime feu mover, a spring controlled plunger switch arranged to close an electric circuit, said plunger constructed with a laminated anvil end, a slotted support for said laminations, said laminated end'arranged to be pressed in and close-the switch by the advancing end of the traveling stock, the laminations arftrolled plunger switch arranged to close an ranged to pass inside the slotted support, said slotted support provided with a beveled end and. arranged'to divert and dislodge the travelling stock.

29. Flying shear mechanism for sever-l ing travelling stock, comprising a base, a reciprocable carriage thereon, a rotatable hollow shaft mounted in said carriage surrounding said travelling stock, means for rotating said hollow shaft, a prime mover to reciprocate said carriage, electric devices to control a supply of compressed fluid to said prime mover, a shearing knife mounted on said carriage, an adjustable spring conelectric circuit through said devices, said plunger constructed with a laminated anvil lend, a slotted support for said laminations,

said laminated end] arranged to be pressed in and close the switch by the advancing end of the travelling stock, the laminations arranged to pass inside the slotted support, said slot-ted support provided with a beveled end and arranged to divert and dislodge the travelling stock, said carriage and shearing knife arranged to be actuated and shear said stock after said plunger switch is closed.

30. Flying shear mechanism for severing travellingstock, comprising a base, a reciprocable carriage thereon, a rotatable hollow shaft mounted in said carriage surrounding said travelling stock, means for rotating said hollow shaft, a prime mover to reciprocate said carriage, electric devices to control a supply off' compressed fluid to said prime mover, a shearing knife mounted on said carriage, an adjustable springv controlled plunger switch arranged to close an electric circuit through said devices, said plunger constructed with a laminated anvil end, a slotted support for said laminations, said laminated end arranged to be pressed in and close the switch by the advancing end of the v travelling stock, the laminations arranged to pass'inside the slotted support, said slotted support provided with a beveled end and arranged to dfert and dislodge the travel.- ling stock, sai "carriage and shearing knife arranged to be actuated and shear said stock after said plunger switch is closed, said plunger switch arranged to rebound and break the electric circuit through said devices after said travelling stock has been revered and dislodged.

3l. Flying shear mechanism for severing travelling stock, comprising a base, a reciprocable carriage thereon, a rotatable hollow shaft mounted in said carriage surrounding said travelling stock, means for rotating said hollow shaft, means tol shear said stock at predetermined intervals, adjustable means to control the shearing means, a plunger having a. laminated anvil end, a slotted sup-r port for said laminations, the support having 

